It seems strange trying to explain what precisely makes Vinny special. The 'self-proclaimed' special one, as he is often called; 'His Specialness' as his cat, Sonny Corleone, brands him, mockingly.
So, is Vinny all that special? Of course he is. Vinny is the figure against which all cats are judged: and not just cats, but dogs and any other furry or hairy household inhabitant.